No, there isn't. I suggest you get the companion Veronica at the 188 Trading Post (on route 95 towards new vegas, you'll likely take the road after your business at Boulder City with the confrontation between the Great Khans and NCR.) Thek826 22:30, June 2, 2011 (UTC)
He's dead and i suggest getting Lily at Jacobstown she's powerful, carries a Vertibird blade for melee, (which she calls Leo) and a Unique Non-Playable Silenced Assault Carbine.
Cass with Trail carbine or a Marksman Carbine is also a good choice.
Only if you're playing on PC and doesn't mid using console commands or mods. Otherwise he's gone.
In a word? No
You can also just revert back to an older save, lose some progress.
PS: why the hell did you killed him? Here's hoping it was accidental, otherwise you're pretty stupid. I mean, there's no notable loot on him, he uses a Merc Grunt outfit, he gives you one of his 1st Recon Beret, and his rifle it's nothing more than the usual Hunting Rilfe with a Scope, which you can buy at Gun Runners.
Asshole. Boone's a nice fella.
just explain to me what was your motivation to kill Boone?